Apple Stops Signing iOS 15.5 Following iOS 15.6 Release, Downgrading No Longer Possible
Following the launch of iOS 15.6 last Wednesday, Apple has stopped signing iOS 15.5, the previously available version that came out in mid-May. Since iOS 15.5 is no longer being signed, it is not possible to downgrade to that version of iOS after installing iOS 15.6.

Apple routinely stops signing older versions of software updates after new releases come out in order to encourage customers to keep their operating systems up to date, so it is not unusual that iOS 15.5 is no longer being signed.
iOS 15.5 was a relatively small-scale update, with improvements to Apple Cash in the Wallet app and a new setting that lets Podcasts users limit the number of episodes stored on their devices.
Released on July 20, iOS 15.6 was a similarly minor update and introduced a handful of features including an option to restart, pause, rewind, and fast-forward a live sports game that's in progress. It also addressed some small bugs, including an issue that could cause the Settings app to continue to display that device storage is full even when it's not.
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Apple today released iOS 15.6 and iPadOS 15.6, the sixth major updates to the iOS and iPadOS 15 operating systems that were initially released in September 2021. iOS 15.6 and iPadOS 15.6 come around two months after the launch of iOS 15.5 and iPadOS 15.5.
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Apple today seeded second release candidate versions of upcoming iOS 15.6 and iPadOS 15.6 updates to developers and public beta testers for testing purposes, with the new software coming three days release of the first RCs. The release candidate updates represent the final versions of iOS 15.6 and iPadOS 15.6 that are expected to be released to the public next week.
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Top Rated Comments
Second is the notifications, when long pressing on a notification to see more details there’s no longer an option to clear (X) it but you have to tap in the grey area to dismiss and then swipe from right to left to clear it and then move on to the next one. Extra steps that slow down the interface.
There’s a few visual display bugs like swiping up in the notification area shows a grey box at the top and safari address bar at the bottom in privacy mode jumps when scrolling favorites.